CN1136186A - Administrating system for low voltage carrier electric power - Google Patents
Administrating system for low voltage carrier electric power Download PDFInfo
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- CN1136186A CN1136186A CN 95113716 CN95113716A CN1136186A CN 1136186 A CN1136186 A CN 1136186A CN 95113716 CN95113716 CN 95113716 CN 95113716 A CN95113716 A CN 95113716A CN 1136186 A CN1136186 A CN 1136186A
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Abstract
A low-voltage carrier system for electric energy management of low-voltage power line features that power carrier transceiver for data collecting device, data acquisition devices and data setting device in this system uses two modulations and two demodulations, the primary modulation is completed by software and correspondent secondary demodulating circuit has simple structure, so increasing data transmission reliability and anti-interference power of system and reducing system cost.
Description
The application belongs to the PLC technology field, relates in particular to a kind of administrating system for low voltage carrier electric power.
The electric energy management of power line carrier at home and abroad is a newer research project in the electric system, and it has more superiority than wireless mode, audio frequency mode.According to the difference that loads on electric pressure, can be divided into high pressure, middle pressure, low pressure carrier wave, its usable range arrives transformer station greatly, and is little of the resident, and its major function comprises data acquisition, load control, data processing, pre-paying and time-of-use tariffs etc.At present, the domestic design and operation of having finished middle ballast ripple electric energy management system is characterized in and can only realizes on medium-voltage line, and carrier transmission performance impedance instability.Aspect low pressure carrier wave, because the interference in the low voltage electric network will influence the normal operation of data communication more than medium voltage network, so anti-interference problem is the difficult point that low pressure carrier wave is realized.Used many repeaters in the external administrating system for low voltage carrier electric power,, strengthened the cost of system like this, made its cost, be not suitable for China's national situation far above domestic present level to improve the signal transmission quality.
It is lower that the application's purpose provides a kind of cost, anti-interference strong administrating system for low voltage carrier electric power.
Provide technical scheme as follows: administrating system for low voltage carrier electric power comprises that low pressure carrier wave data concentrator, low pressure carrier wave data acquisition unit, low pressure carrier wave data are provided with device three parts for this reason.Wherein the low pressure carrier wave data concentrator is formed by power carrier machine for receiving and emitting message, processor of single chip computer, printer with the communication module socket that middle ballast phase of wave connects; The low pressure carrier wave data acquisition unit is made up of power carrier machine for receiving and emitting message, processor of single chip computer, watt-hour meter photoimpact sensor and functional module; The low pressure carrier wave data are provided with device and are made up of power carrier machine for receiving and emitting message, processor of single chip computer, the feature of this system is to have increased a primary modulation and a demodulation on data concentrator, data acquisition unit, data are provided with power carrier machine for receiving and emitting message in the device, make it have secondary modulation, secondary demodulation, the primary modulation and a demodulation of ballast ripple during this is different from.Wherein the method for primary modulation is to adopt following steps to realize: 1. utilize the characteristic of serial port of single chip computer output, obtain a unifrequent square wave output earlier; 2. change the timing constant of serial port output, can obtain the square wave output of different frequency; 3. the various combination of frequency of output is corresponding with the data that will send (binary-coded decimal); 4. one frequency is set in addition again as the end mark that sends data.So just obtained by the frequency hop sequences of primary modulation.The realization of secondary demodulation (corresponding to primary modulation): the amplification signal that receives in the power carrier machine for receiving and emitting message is delivered to triode after by a demodulation and is amplified, signal after the amplification is sent into the input end of 5 LM567 respectively, through the output terminal output of LM567, send into the data of decoding and obtaining being transmitted in BCD demoder and the logic processor.
Administrating system for low voltage carrier electric power is directly to use on the net at low-voltage distribution towards the user of basic unit, and 220 volts low-voltage circuit is not a very clean signalling channel, can there be various noises in the secondary network, this just requires the reliability of data to want height is that the antijamming capability of carrier communication is strong especially, also requires cost low in addition.In native system, increased make after primary modulation, the demodulation data in transmission by secondary modulation and demodulation, improved the reliability of data, strengthened antijamming capability, because the primary modulation, the demodulation that increase are simple in structure, cost is low, therefore also reduced the cost of total system, be suitable for very much in low voltage power distribution network, using.
Below in conjunction with the embodiment accompanying drawing the application is described in further detail.
Fig. 1 is the administrating system for low voltage carrier electric power block diagram
Fig. 2 is a low pressure carrier wave data concentrator block diagram
Fig. 3 is a low pressure carrier wave data acquisition unit block diagram
Fig. 4 is that the low pressure carrier wave data are provided with the device block diagram
Fig. 5 is a power carrier machine for receiving and emitting message block diagram
Fig. 6 is frequency hopping code translator (secondary demodulation device) circuit theory diagrams
Fig. 7 is BCD demoder and logic processor circuit theory diagrams
Fig. 1 expresses the composition and the usable range of administrating system for low voltage carrier electric power, and system is provided with device three parts by low pressure carrier wave data concentrator, low pressure carrier wave data acquisition unit, low pressure carrier wave data and forms, and is used for from transformer B
1In the 220V low-voltage network of output, data acquisition unit how much be according to what of collection point (ammeter) by the system support setting, omit among the figure and express n collector.Fig. 2 low pressure carrier wave data concentrator is made up of power carrier machine for receiving and emitting message, processor of single chip computer, mini-printer and communication module socket, and the setting of communication module socket is in order to realize the communication with middle ballast ripple electric energy management.This system can collect concentrator with each ammeter data, and the data of every ammeter are printed by mini-printer, and can pass to transformer station by middle ballast ripple, links to each other with transformer station long distance meter reading equipment, realizes and the communication of middle pressure.Fig. 3 low pressure carrier wave data acquisition unit is made up of power carrier machine for receiving and emitting message, processor of single chip computer, watt-hour meter photoimpact sensor, functional module and power supply.Functional module can be equipped with on demand, for example IC-card, standard clock and other expanded function or the like.Fig. 4 low pressure carrier wave data are provided with device and are made up of power carrier machine for receiving and emitting message, processor of single chip computer, keyboard and power supply.The inner composition of expressing the power carrier machine for receiving and emitting message that divides of Fig. 5 dotted line, therefrom as can be seen data send and receiving course in the process of modulated and demodulation.Processor of single chip computer carries out primary modulation earlier to the data (binary-coded decimal) that will send, through communication coding, BCD coding, the frequency hop sequences of frequency hopping coding back output in audiorange, send into then voltage controlled oscillator, prime amplifier, tuned power amplifier by secondary modulation after, be coupled on the line of electric force by the electrically couple device; The reception of data is through the electrically couple device, send into frequency-selecting amplifier, frequency modulation discriminator, after a demodulation, send into frequency hopping code translator (secondary demodulation device) again and carry out secondary demodulation, after BCD demoder, logic processor the data demodulates that receives is come out, enter processor of single chip computer, primary modulation is to realize the frequency hop sequences of output in audiorange with software in the whole process, and secondary modulation is frequency hop sequences to be loaded into carrier frequency in the mode of frequency modulation get on; A demodulation is to demodulate frequency hop sequences, and secondary demodulation is to demodulate the BCD coding that will receive.
The implementation method of primary modulation is such: the characteristic of utilizing serial port of single chip computer output, repeat to send out 55H and can obtain a unifrequent square wave output, change the timing constant of serial port output, then can obtain the square wave output of different frequency, the various combination of frequency of output is corresponding with the data that sent (binary-coded decimal), can obtain by the frequency hop sequences of primary modulation.Certainly to a certain single frequency sequence, a specific time span be arranged, define five different frequency f for this reason
A, f
B, f
C, f
D, f
E, with four of data binary-coded decimal (0000-1111) respectively with f
D, f
C, f
B, f
AFour frequencies are corresponding one by one, if the position of data binary-coded decimal correspondence is 1 o'clock, the frequency f corresponding with this sent, if 0 is not sent out, send out f when one group of binary-coded decimal distributes
E, as the end mark of one group of binary-coded decimal.In the secondary demodulation circuit with f
EFor sign can obtain corresponding interruption signal.If send out a number " 7 ", then Dui Ying binary-coded decimal is " 0111 ", the frequency hop sequences that sends through primary modulation be combined as " f
Cf
Bf
Af
E", carry out secondary modulation again and be coupled on the line of electric force with the form of frequency modulation.
Adopt two LM567 secondaries to integrate integrated package U in Fig. 6 frequency hopping code translator (secondary demodulation device) circuit theory diagrams, have three among the figure and be respectively U
1, U
2, U
3, U
1, U
2, U
3Be equivalent to 6 LM567, reduced chip cost after the process secondary is integrated.LM567 is a phaselocked loop audio frequency frameshit device, and it has eight pin, and 1,2 pin connect an electric capacity usually respectively over the ground, forms output filter network and loop one pole low-pass filter network, the pullin banwidth of 2 electric capacity that pin connects decision phase-locked loop; 3 pin are input ends, and 4 pin connect working power, and 5,6 pin outer meeting resistance electric capacity have determined the internal voltage controlled oscillator centre frequency, 7 pin ground connection, and 8 pin are output terminals.The basic function of LM567 is: when the signal of 3 pin incoming frequencies in pullin banwidth, 8 pin become low level by high level, and the output of 2 pin is through the sound signal of F/V conversion; If at 2 pin input audio signal, then the output of 5 pin is subjected to the frequency modulation square-wave signal of 2 pin input audio signal modulation.
The amplification signal that the power carrier machine for receiving and emitting message receives enters U by direction shown in the arrow
13 pin, the frequency hop sequences that obtains after a demodulation is from U
12 pin output, only used a slice LM567 here.From U
1The frequency hop sequences of 2 pin output send into triode BG, after amplifying through triode BG, deliver to U by the collector of triode
17 pin (another sheet LM567), U
27 pin, 3 pin, U
37 pin, 3 pin, U
1, U
2, U
3The local frequency of (5 LM567) is respectively f
A, f
B, f
C, f
D, f
E, this single-frequency with the frequency hopping of primary modulation output is identical, U in the circuit
1, U
2, U
3Be the single branch road after BG amplifies, do not mark the common connection of part among the figure by LM567.The a certain single-frequency and the U of the frequency hop sequences after a demodulation
1, U
2, U
3Local frequency equate or when dropping in the corresponding bandwidth, then the circuit output end of this single-frequency correspondence is 0 (low level), U in the secondary demodulation circuit
1, U
2, U
3Output terminal be respectively U
112 pin, U
212,16 pin, U
312,16 pin, A, B, C, D, E are circuit output end among the figure.When the frequency hop sequences after the demodulation arrived, this array circuit was exported with Transistor-Transistor Logic level, thereby is finished secondary demodulation from A, B, C, D, E end.
After Fig. 7 BCD decoding and logical process were achieved in that the signal of secondary demodulation output is exported with Transistor-Transistor Logic level from A, B, C, D, E point respectively, the output of this correspondence triggered U
8(U
8Be the 4RS trigger), make the set of 4RS trigger, when the E point is exported, pass through U
9Obtain interrupting signal, single-chip microcomputer 80C31 reads in the data in the 4RS trigger, and the data of just having finished one group of binary-coded decimal transmit, then single-chip microcomputer zero clearing 4RS trigger.Here U
8Adopt 74LS279, U
9Adopt 74LS00.
The number of sending out during primary modulation " 7 ", entering amplifier at acceptance point by the electrically couple device through power line transmission amplifies, obtain frequency hop sequences through a demodulation again, this frequency hop sequences obtains C, B, A, E output behind secondary demodulation, and triggering 4RS trigger, with interrupt mode data " 7 " are read in the single-chip microcomputer, finished the process of transmitting of data.
In this administrating system for low voltage carrier electric power, adopt " primary modulation ", " secondary demodulation " to greatly reduce cost, and solved the problem that in the low pressure carrier wave data transfer procedure, requires to have very strong antijamming capability effectively.
Claims (1)
1, administrating system for low voltage carrier electric power is by the low pressure carrier wave data concentrator, the low pressure carrier wave data acquisition unit, the low pressure carrier wave data are provided with device and form, the low pressure carrier wave data concentrator is by the power carrier machine for receiving and emitting message, processor of single chip computer, printer, the communication module socket is formed, the low pressure carrier wave data acquisition unit is by the power carrier machine for receiving and emitting message, processor of single chip computer, watt-hour meter photoimpact sensor and functional module are formed, the low pressure carrier wave data are provided with device by the power carrier machine for receiving and emitting message, processor of single chip computer is formed, data concentrator, data acquisition unit, the power carrier machine for receiving and emitting message that data are provided with in the device passes through voltage controlled oscillator to the primary modulation that sends data, prime amplifier, tuned power amplifier is realized, and be coupled on the line of electric force by the electrically couple device, the reception of data is through the electrically couple device, and pass through frequency-selecting amplifier, frequency modulation discriminator is realized a demodulation, it is characterized in that having increased on the power carrier machine for receiving and emitting message primary modulation and a demodulation
Wherein the method for primary modulation adopts following steps:
---utilize the characteristic of processor of single chip computer serial port output, obtain a unifrequent square wave output earlier
---change the timing constant of serial port of single chip computer output, obtain the square wave output of different frequency
---the different frequency of output is corresponding one by one with the data binary-coded decimal that will send
---a frequency is set as the end mark that sends data
---if the position of data binary-coded decimal correspondence is 1 o'clock, the frequency corresponding with this sent,, when one group of binary-coded decimal distributes, sent out the end mark frequency if 0 is not sent out;
Secondary demodulation circuit corresponding to primary modulation is characterised in that: through the signal of a demodulation of frequency modulation discriminator output, enter a triode, after triode amplifies, export the input end that enters five LM567 respectively, output termination BCD demoder and the logic processor circuit of five LM567 from the collector of triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95113716 CN1136186A (en) | 1995-07-29 | 1995-07-29 | Administrating system for low voltage carrier electric power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95113716 CN1136186A (en) | 1995-07-29 | 1995-07-29 | Administrating system for low voltage carrier electric power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1136186A true CN1136186A (en) | 1996-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95113716 Pending CN1136186A (en) | 1995-07-29 | 1995-07-29 | Administrating system for low voltage carrier electric power |
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|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375129C (en) * | 2006-03-13 | 2008-03-12 | 常州苏源永利达电子科技有限公司 | Remote management system for ammeter data |
| CN101136723B (en) * | 2006-08-31 | 2012-07-04 | 上海协同科技股份有限公司 | Self-adaptive electric power carrier wave concentrator |
| WO2012113219A1 (en) * | 2011-02-24 | 2012-08-30 | 国网信息通信有限公司 | Method and device for controlling operating mode of household electrical appliance, and intelligent household electrical appliance controller |
| CN103337155A (en) * | 2013-05-24 | 2013-10-02 | 安徽久大电子技术有限公司 | Multi-environment-adaptive all-weather dynamic-management low-voltage power line carrier remote centralized meter reading method |
| CN105187680A (en) * | 2015-08-19 | 2015-12-23 | 长沙威胜信息技术有限公司 | Transformer substation data acquisition communication MODEM and modulation-demodulation method |
-
1995
- 1995-07-29 CN CN 95113716 patent/CN1136186A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375129C (en) * | 2006-03-13 | 2008-03-12 | 常州苏源永利达电子科技有限公司 | Remote management system for ammeter data |
| CN101136723B (en) * | 2006-08-31 | 2012-07-04 | 上海协同科技股份有限公司 | Self-adaptive electric power carrier wave concentrator |
| WO2012113219A1 (en) * | 2011-02-24 | 2012-08-30 | 国网信息通信有限公司 | Method and device for controlling operating mode of household electrical appliance, and intelligent household electrical appliance controller |
| CN103337155A (en) * | 2013-05-24 | 2013-10-02 | 安徽久大电子技术有限公司 | Multi-environment-adaptive all-weather dynamic-management low-voltage power line carrier remote centralized meter reading method |
| CN103337155B (en) * | 2013-05-24 | 2016-05-25 | 安徽久大电子技术有限公司 | Adapt to the round-the-clock dynamic management low pressure carrier remote-registering of many environment method |
| CN105187680A (en) * | 2015-08-19 | 2015-12-23 | 长沙威胜信息技术有限公司 | Transformer substation data acquisition communication MODEM and modulation-demodulation method |
| CN105187680B (en) * | 2015-08-19 | 2019-01-25 | 长沙威胜信息技术有限公司 | Substation data acquisition communication MODEM and modulation-demo-demodulation method |
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